Have you seen what mercury uses??? If they get away with those, there's more in proper machining than anything else.

The guy sitting next to you looks like he's $hitting has pants!!

i told him he needed sun glasses but he said he would be ok without them.i dont think he was enjoying his first ride at 120 plus.lol.

Cool. Good job guys.

So this crew of 4 geniuses couldn't make a centrifugal blower work?

no geniusis here,the centrifugal blower worked fine at a reasonable boost leval[12lbs] but not so good at 15 lbs on pump gas.the boat owner wanted more than physics will allow.you can not put a drag strip tuneup in a marine engine and expect it to live.hope this answered your question.

Oh it could have worked. But our buddy was not willing to reduce the boost level, to a reasonable PSI, for it to live. This was a carbed M4 application, that did make well over 1000HP on the dyno.

However, in the boat, it was less than stellar. Belt issues, bracket flex, blower getting so got you could fry eggs on it, lack of low end power getting on plane with a 42ft boat, and overall, it just wasnt a good combination as far as the static compression/cam combo he had. It was more suited to a roots than a centrifugal.

There is no doubt the prochargers work great when bolted on a stock EFI merc, running low boost. But imo, once you start getting up there with power levels, the whole thing takes a turn, and really needs to be thought out. And EFI is for sure the way to go there.

[QUOTE=MILD THUNDER;4197298And EFI is for sure the way to go there.[/QUOTE]

and even then its a biotch to tune.especially if it has to run in open loop all the time.
they still make me cringe when asked to tune one.

Nice job guys, cool thread.

Could you or budman provide me a link to that build?
In my search I only found a thread for the intake manifold on it.
Thanks
See ya,
Kelly

Kelly, it's about 150yrs long. Are you sure you want to read it ? LOL.